Duchardt-Ferner, Elke ; Gottstein-Schmidtke, Sina R. ; Weigand, Julia E. ; Ohlenschläger, Oliver ; Wurm, Jan-Philip ; Hammann, Christian ; Suess, Beatrix ; Wöhnert, Jens (2016):
What a Difference an OH Makes: Conformational Dynamics as the Basis for the Ligand Specificity of the Neomycin-Sensing Riboswitch.
In: Angewandte Chemie (International ed. in English), 55 (4), pp. 1527-1530. ISSN 1521-3773,
[Article]
Abstract
To ensure appropriate metabolic regulation, riboswitches must discriminate efficiently between their target ligands and chemically similar molecules that are also present in the cell. A remarkable example of efficient ligand discrimination is a synthetic neomycin-sensing riboswitch. Paromomycin, which differs from neomycin only by the substitution of a single amino group with a hydroxy group, also binds but does not flip the riboswitch. Interestingly, the solution structures of the two riboswitch-ligand complexes are virtually identical. In this work, we demonstrate that the local loss of key intermolecular interactions at the substitution site is translated through a defined network of intramolecular interactions into global changes in RNA conformational dynamics. The remarkable specificity of this riboswitch is thus based on structural dynamics rather than static structural differences. In this respect, the neomycin riboswitch is a model for many of its natural counterparts.
| Item Type: | Article |
|---|---|
| Erschienen: | 2016 |
| Creators: | Duchardt-Ferner, Elke ; Gottstein-Schmidtke, Sina R. ; Weigand, Julia E. ; Ohlenschläger, Oliver ; Wurm, Jan-Philip ; Hammann, Christian ; Suess, Beatrix ; Wöhnert, Jens |
| Title: | What a Difference an OH Makes: Conformational Dynamics as the Basis for the Ligand Specificity of the Neomycin-Sensing Riboswitch. |
| Language: | English |
| Abstract: | To ensure appropriate metabolic regulation, riboswitches must discriminate efficiently between their target ligands and chemically similar molecules that are also present in the cell. A remarkable example of efficient ligand discrimination is a synthetic neomycin-sensing riboswitch. Paromomycin, which differs from neomycin only by the substitution of a single amino group with a hydroxy group, also binds but does not flip the riboswitch. Interestingly, the solution structures of the two riboswitch-ligand complexes are virtually identical. In this work, we demonstrate that the local loss of key intermolecular interactions at the substitution site is translated through a defined network of intramolecular interactions into global changes in RNA conformational dynamics. The remarkable specificity of this riboswitch is thus based on structural dynamics rather than static structural differences. In this respect, the neomycin riboswitch is a model for many of its natural counterparts. |
| Journal or Publication Title: | Angewandte Chemie (International ed. in English) |
| Volume of the journal: | 55 |
| Issue Number: | 4 |
| Divisions: | 10 Department of Biology 10 Department of Biology > Synthetic Genetic Circuits 10 Department of Biology > RNA Biochemistry |
| Date Deposited: | 22 Dec 2015 11:12 |
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